Method for treating asbestos.



UNITED STATES PATENT OFFICE.

ALPHEUS HUGH HIPPLE, OF OMAHA, NEBRASKA.

METHOD FOR TREATINGASBESTOS.

Specification of Letters Patent.

Patented Aug. 7, 1906.

Application filed November 10, 1905- Serial No. 286,698.

ess for treating asbestos so as to vulcanize the same.

Reference is made to my Patent No. 694,859, dated March 4, 1902, which describes a process upon which the present that the pulp becomes nearly or quite saturated.

The pulpor the articles made therefrom,

/ as the case maybe, is next placed in a steamvulcanizer 'the temperature of which is about 300 Fahrenheit. This temperature is maintained for a definite eriod of time, usually 60 two hours or more, t e paper, millboard, or other articles being wrapped or inclosed in such manner as to prevent changes in form while the heat is applied. After the vulcanizing process is complete the paper, mill- 65 board, or articles are removed and allowed to cool.

i 5 method is an improvement.

The desirability of working up asbestos fiber and permeating the same with a substance to be vulcanized is described in my patent 'ust mentioned. It is essential, however, t at asbestos fiber, oil, and sulfur be admixed in suitable roportions and that a gentle heat be applie for a suitable length of time in order to enable vulcanization to take lace. It is ver difiicult to admix asbestos her, oil, and su fur in proper proportions for the purpose stated, for the reason that the fiber has a tendency to form into lumps, so that the composite mass thus formed is not uniform. If, on the other hand, the asbestos 0 be in the form of pa er or millboard and treated with oil and su fur, the oil penetrates readily throughout the mass ,while the sulfur is deposited superficially thereupon. In cases where the aper or millboard is very thick the oil within the interior of the paper or the mass does not therefore become sufficiently vulcanized. To overcome these difficulties, I take asbestos fiber, powdered sulfur, and water and work the same into a pulp of the 0 consistency used for making asbestos paper or millboard. The pulp being formed, pressure isapphed so as to squeeze out a part of The proportions of the ingredients used may be varied within wide limits. The quantity of oil which an article made of asbestosis capa- 7o ble of absorbing depends largely upon the density of the article. The amount of sulfur to be used depends to some extent upon the charactor of the oil. Oxidized oils or boiled oils state. Ordinarily if raw linseed-oil be used there will be required for each one hundred parts, by weight ,of asbestos fiber from twentyfive to fifty parts of oil and for each one hundred parts of oil from twenty to thirty parts of sulfur.

Having thus described my invention, I claim as new and desire to secure by Letters Patenth 1. The method herein described of treating asbestos, which consists in working asbestos fiber and sulfur into a pulp with water, removing the water, saturatin the residual mass with oil, and subjecting t e mass thus treated to the action of heat until vulcaniza- 0 tion takes place.

'2. The method herein described of treating asbestos, which consists in working asbestos fiber and sulfur into a ulp with water, shaping said pulp into the orm of paper or 5 require less sulfur than oils in their natural 75 50 per ulp.

the water, and the mass is next dried. Oil is now added and is readily absorbed, owing to 45 the porous nature of the dried pulp.

It will be understood that the asbestos pulp containing the sulfur may be formedinto aper, millboard, blocks, and various ot er shapes, as is done with ordinary wood or pae oil above mentioned is a drying-oil, linseed-oil bein excellent for the purpose. The exposure 0 the pulp to the oil is such articles, causin said paper or articles to absorb oil, and su jectin said paper or articles containing said oil to t e action of heat until vulcanization takes place.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ALIHEUS HUGH HIPPLE. Witnesses:

HELEN Oaowa, C. AARON HULL. 

